Question

A service transformer has a secondary power rating of 11.1 kVA and 5.4 kW. What is...

A service transformer has a secondary power rating of 11.1 kVA and 5.4 kW. What is the phase shift (in degrees) between voltage and current (theta) for this transformer? (Answer format [ _ _ . _ _ ])

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Answer #1

Given Secondary power rating

P = 5.4 KW

S = 11.1 KVA

Phase shift between voltage and current ()

COS = P / S

COS = 5.4 k / 11.1 k

COS = 0.486

= Cos -1(0.486)

= 60.89

Phase shift between voltage and current for this transformer = 60.89 degrees

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